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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b793b24b621533a338896bcb8ea2a154094cc37e363eb4fb35aa49c6bde4009' 
  AND token = '5N4AQwSC5dHyupM0tEkfvqEQ4p1+b69NRmApV6lZJIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}